Furnace construction



April 23, 1929. T. E. PURCELL. 1,710,241

FURNACE CONSTRUCTION Filed July 30, 1925 2 Sheets-Sheet 2 j INVENTOR uw CQ. M B Y I MW A TTRNEY' Patented Apr. 53, it.

Lnazn THOMAS E. PURCELL, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO INTERNA- TIONAL COMBUSTION ENGINEERING CORPORATION,

WARE.

Application :filed July 30, 1925.

This invention relates t0 furnace constructions and is particularly useful in furnaces adapted for the burning of pulverized fuel in suspension.

' One of the primary objects of the invention 's to provide a simple and effective furnace wall which may be readily built and maintained.

Another object of the invention is to provide a furnace wall construction in which provision is made for the admission of combustion air in a novel and simple manner.

More specifically my invention aims tosubstitute a simple and inexpensive wall in substitution for the hoilow wall construction now frequently employed in installations burning pulverized coal. K y

In general my invention resides 1n the novel features and combination of parts to be more particularly describedhereinafter.v

How the foregoing, together with such other objects as may hereinafter appear, orv

are incident to my inventioinare realized,'is

illustrated in preferred form inthe accom' f panying drawings, wherein Fig. 1 is a vertical sectionthru a portion of a furnace embodying my improvements, the section being taken on the line lkl of F ig. 3; Fig. 2 is a vertical section thru a portion of the wall of Fig. 1 drawn on an enlarged scale, the section being taken on the line 2 -2 of Fig. 3 is a horizontal section thru a portion of the wall of Fig. 1, drawn on an enlarged scale; p

I Fig. 4 is a section taken on the line 4-4, of Fig. 3, and

Fig. 5 is a horizontal sectional View illustrating a corner of the furnace structure.

The invention is particularl useful in connection with the front walls of powdered coal burning installations and will be described in connection therewith, altho it may be used elsewhere to advantage.

Referring non7 to Fig. v1, the furnace is indicated as a whole by the reference letter A, the combustion chamber having an outlet 7 in the upper part thereof over which extend the boiler tubes 8, it being understood that any type boiler may be employed. The furnace is composed of the front wall B, the side Walls C, the rear wall (not shown), the hopcomposed of .A CORPORATION OF DELA* FURNACE CONSTRUCTION.

- Serial No. 46,966.

per shaped bottom D, the suspended arch E and the throat F which forms the outlet 7.

Specifically considering the front wall, it is refractories, to be described; and the outer metallic casing Qsecured to and supported by the vertical buck-stays 10; and the horizontal beams 11 which latter are secured to the buck-'stays in the manner indicated in Fig. 2. The refractory portion of the Wall consists of a base portion l2 composed of ybricks or the like and carried by the structural work 1 3.,- theslieathing 14; and a tier 15 composed of two kinds of bricks, namely the holding tile 16 and the filler bricks 17. The filler bricks 17 are of L 3 with a vertical groove 18 along one edge adapted to engage with the head 19 of vertically extending holding castings 20 secured to the buck-stays as shown in Fig. 3. The spacing of the holding castings 2O and the dimensions ofthe bricks 17 are such as to provide a gap 21 between the legs of adjacent bricks in order that these bricks may be readily as lsgembled, removed or replaced as the case may e f Y The holding tiles16v are of substantially similar construction with the exception that the dimensions of the bricks, with reference to the spacing of the holding members 20 are such that a pairxof these bricks in effect constitutes a U. These bricks are -formed so as to engage the heads 19 of the holding castl ings in the manner already described.

The

tier l5 comprises the course of the bricks 16,

anumber of courses of the bricks 17 a course' etc. .When the .wall 1s comof the bricks 16, pleted it will be s een that the bricks 16 cannot fall out of place but are heldby the holding castings 20.A The bricks'17 are held inplace by virtue of the fact that they rest upon one another and are in effect carried by the holding tile 16. The construction of the bricks 16 and 17 is such as to provide vertical ducts 22 within the wall, the' gaps 21 formed by the bricks 17 lconstituting inlet or delivery openings from the duct-s into the interior of the combustion chamber. Combustion air is supplied to the ducts thru a plurality of inlet openings 23Which inlets are damper controlled. l At the top and bottom of each duct is a larger dampercontrolled inlet 24.

It will be seen that the wall can be readily built and maintained and shaped as indicated in Fig.l

' nels simple in construction. Except at certain points all ot' the bricks ll' and all ot the bricks lo may be, counterparts oit one another which tends toward cheapness and ease ot assemblage and repair. Furthermore. the wall can f )and and contract freely. rhe sheathing foyided merely for the purpose al protc mg -ihe metallic casing from the heat and 'llames because ot the presence et the openings thru the wall. s

'lie side walls, have the same metallic outer casing l) and the sheathing la.

it points opposite the buckstays il) there are channels which '-onstitute a part ot the metallic casing. Metallic strengthening and attach i ng strips QG are interposed between the base ol the, holding castings 2O and the chan- At points intermediate the buckslays. strips Yo are inlerpo;-.ed belwian the metallic casing and the base of the holding castings 2O and blocks 2T are interposed between the horizontal channels ll and the metallic casing at intervals. which holding castin is provided with web portions 28 tor purposes ot strength and tor holding the sheathing. lt desired asbestos mill board 29 or the like is interposed between the metallic casing and the sheathing. Fire clay is pret erably used between the faces ot adjacent bricks and there is an expansion joint BO between the side wall andthe iront wall.

Vhat l claim is:

l. A furnace wall structure including substantially vertically extending holding members. and aretractory wall composed of adjacent reversely placed L-shaped bricksndapted to engage the holding members and so disposed that pairs of bricks cooperate to provide a duct.

SZ. A furnace wall structure including substantially vertically extending holding members. and a refractory wall composed of adjacent reversely placed L-shaped bricks adapted to engage the holding members, certain ot the bricks having a dimension such as to provide a gap between the legs ht pairs of bricks.

3. A furnace wall structure including substantially vertically extending holding members` and a relraetory wall composed of' adjacent reversely placed L-shaped. bricks adapted to engage the holding members and so disposed that pairs ot bricks cooperate to pro ride a duct, said holding members the bricks at the sides thereof their outer laces.

la furnace wall outer shell. structural work thereor, or the shell. vertically extending spaced brick holding members, l tory wall composed of bricks horizontal pairs, each pair .l ng ee jacent holding niembcrsrand sait members interlocking with the orios. n bricks bang so shaped and disposed pair thereotA cooperate to iorm a channel.

5. i l'irnace wall structure including an outer shell. structural work therefor, a lining lor the shell. vertically extending laterally spaced brick holding members. and a retractory wall composed ot bricks arranged in horizontal pairs, each pair lying between adjacent holding members, and said holding members interlocking with the bricks. and the bricks being so shaped and disposed that a pair thereof cooperate to form a channel, and said shell and lining having air inlet means to the channels formed by the bricks.

A furnace wall structure including an outer shell, structural work therefor, a lining tor the shell. vertically extending laterally spaced brick holding members, and a refractory wall composed ot bricks arranged in horizontal pairs, each pair lying between adjacent. holding members. and said holding members interlocking with the bricks, and the bricks being so shaped and disposed that a pair thereof cooperate to form a channel whereby ducts are provided within the wallA T. A furnace wall structure includingv an outer shell, structural work therefor, a lining tor the shell. vertically extending laterally spaced brick holding members, and a retractory wall composed of bricks arranged in horizontal pairs. cach pair lying between adjacent holding members` and said holding members interlocking with the bricks. andthe bricks being so shaped and disposed that a pair whereby ducts are provided within the wall, together with meanswhereby air may be admitted to the ducts.

In' testimony where-ot. I have hereunto signed my name.

THOMAS E. PURCELL.

therco't' cooperate to form a channel 

